package Udp;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.io.IOException;
import java.util.Scanner;

public class UdpEchoClient {
    private int serverPort;
    private String serverIp;
    private DatagramSocket socket = null;
    public UdpEchoClient(String serverIp,int serverPort) throws SocketException {
        this.serverIp = serverIp;
        this.serverPort = serverPort;
        socket = new DatagramSocket();
    }
    public void start() throws IOException{
        System.out.println("客户端启动");
        Scanner scanner = new Scanner(System.in);
        while(true) {
            System.out.println("请输入需要发送的数据:");
            String request = scanner.next();
            DatagramPacket requestPacket = new DatagramPacket(request.getBytes(),0,request.getBytes().length,
                    InetAddress.getByName(serverIp),serverPort);
            socket.send(requestPacket);
            DatagramPacket responsePacket = new DatagramPacket(new byte[4096],4096);
            socket.receive(responsePacket);
            String response = new String(responsePacket.getData(),0,responsePacket.getLength());
            System.out.println(response);
        }
    }

    public static void main(String[] args) throws IOException{
        UdpEchoClient client = new UdpEchoClient("127.0.0.1",9098);
        client.start();
    }
}
